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grbl
An open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on a straight Arduino (by gnea)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can use NO limit switches with GRBL. Here is some info. But NC is generally a better option because if there is a failure in a wire or connector, the circuit will open and stop the machine.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.